Lower limb motor imagery EEG dataset based on the multi-paradigm and longitudinal-training of stroke patients

In this dataset, we collected EEG data from 27 stroke recovery patients, with disease durations ranging from 1 to 12 months. The participants included 23 males and 4 females, aged between 33 and 68 years. Among the patients, 18 had right hemiplegia, and 9 had left hemiplegia.
There are five distinct experiments: the initial assessment with a conventional paradigm prompted by text (Pre), initial assessment with an invariable electrical stimulation paradigm (IES), initial assessment with a gait-phase-encoded sequential sensory electrical stimulation paradigm (SES), post-treatment assessment with a conventional paradigm (Post), and follow-up assessment with a conventional paradigm (Follow). Each experiment comprised two tasks: gait MI and a idle-state task, where participants were instructed to focus on kinesthetic motor imagery to perform the gait MI task.
Each trial lasted approximately 12 seconds. At the beginning of each trial (t = 0s), a fixation cross appeared on the screen, where MI tasks were labeled as "1" and idle tasks as "7." At t = 3s, the task text prompt was displayed, where MI tasks were labeled as "2" and idle tasks as "8." At t = 4s, participants started MI or idle task for 5 seconds. No stimulation was applied in the conventional tasks. the IES tasks received a constant sensory electrical stimulation, while the SES tasks received a gait-phase-encoded sequential sensory electrical stimulation. During the MI phase, the labels "3" to "6" were used sequentially according to the gait phase. For the idle tasks, the resting-state phase labeled sequentially as "9" to "12." In each paradigm, participants performed 10 trials each of gait MI and resting tasks in one run, presented in a randomized order.